British murder suspect Shane O'Brien, who is on the "world's most wanted" list, has been detained in Romania.
The 31-year-old is suspected of the murder of 21-year-old Josh Hanson, who was stabbed to death in a bar in Hillingdon, west London, in 2015.
O'Brien fled following Mr Hanson's death and was placed on Interpol's worldwide fugitive list.
There was a £50,000 reward for information which led to his arrest and prosecution.
According to the Metropolitan police, he was detained in Romania on Saturday.
The head of the UK's National Crime Agency's international operations unit, Ian Cruxton, said: "O'Brien has spent several years looking over his shoulder as he has been at the centre of an extensive operation to track him down.
"I'm delighted that the pressure brought to bear by this has finally resulted in him being captured as a result of close working with the Romanian authorities.
"I hope his arrest offers some comfort to the family and friends of Josh Hanson," Mr Cruxton said.